Delete Columns to Make Sorted
You receive an array of n strings strs , all of the same length.
The texts can be arranged such that there is one on each line, making a grid.
For example, strs = ["abc", "bce", "cae"] can be arranged as follows:
abc
bce
cae
You want to delete the columns that are not sorted lexicographically . In the above example ( 0-indexed ), columns 0 ( 'a' , 'b' , 'c' ) and 2 ( 'c' , 'e' , 'e' ) are sorted, while column 1 ( 'b' , 'c' , 'a' ) is not, so you would delete column 1.
Produce the number of columns that you will delete .
Input: strs = ["cba","daf","ghi"]
Output: 1
Explanation: The grid looks as follows:
cba
daf
ghi
Columns 0 and 2 are sorted, but column 1 is not, so you only need to delete 1 column.
Input: strs = ["a","b"]
Output: 0
Explanation: The grid looks as follows:
a
b
Column 0 is the only column and is sorted, so you will not delete any columns.
Input: strs = ["zyx","wvu","tsr"]
Output: 3
Explanation: The grid looks as follows:
zyx
wvu
tsr
All 3 columns are not sorted, so you will delete all 3.
Constraints
n == strs.length1 <= n <= 1001 <= strs[i].length <= 1000strs[i]consists of lowercase English letters.
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